Part 2/3 (GL) of adding with device scale factor to transport surfaces

Add a scale factor argument to glResizeCHROMIUM.

Pass the scale factor on to the resize callback in ImageTransportSurface,
and drop it on the floor there.

BUG=132714
NOTRY=true

Review URL: https://chromiumcodereview.appspot.com/15685003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@202325 0039d316-1c4b-4281-b951-d872f2087c98

27 files changed, 75 insertions, 49 deletions

diff --git a/content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.cc b/content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.cc
index 33f6ea1..ddb92d1 100644
--- a/content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.cc
+++ b/content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.cc
@@ -575,7 +575,7 @@ void WebGraphicsContext3DCommandBufferImpl::reshapeWithScaleFactor(
   cached_width_ = width;
   cached_height_ = height;
 
-  gl_->ResizeCHROMIUM(width, height);
+  gl_->ResizeCHROMIUM(width, height, scale_factor);
 }
 
 void WebGraphicsContext3DCommandBufferImpl::FlipVertically(
diff --git a/content/common/gpu/image_transport_surface.cc b/content/common/gpu/image_transport_surface.cc
index f8f0742..6775a29 100644
--- a/content/common/gpu/image_transport_surface.cc
+++ b/content/common/gpu/image_transport_surface.cc
@@ -191,8 +191,8 @@ void ImageTransportHelper::OnResizeViewACK() {
   surface_->OnResizeViewACK();
 }
 
-void ImageTransportHelper::Resize(gfx::Size size) {
-  surface_->OnResize(size);
+void ImageTransportHelper::Resize(gfx::Size size, float scale_factor) {
+  surface_->OnResize(size, scale_factor);
 
 #if defined(OS_ANDROID)
   manager_->gpu_memory_manager()->ScheduleManage(
@@ -326,7 +326,8 @@ void PassThroughImageTransportSurface::OnResizeViewACK() {
   helper_->SetScheduled(true);
 }
 
-void PassThroughImageTransportSurface::OnResize(gfx::Size size) {
+void PassThroughImageTransportSurface::OnResize(gfx::Size size,
+                                                float scale_factor) {
   new_size_ = size;
 
   if (transport_) {
diff --git a/content/common/gpu/image_transport_surface.h b/content/common/gpu/image_transport_surface.h
index 503a411..0a9b30b 100644
--- a/content/common/gpu/image_transport_surface.h
+++ b/content/common/gpu/image_transport_surface.h
@@ -63,7 +63,7 @@ class ImageTransportSurface {
   virtual void OnBufferPresented(
       const AcceleratedSurfaceMsg_BufferPresented_Params& params) = 0;
   virtual void OnResizeViewACK() = 0;
-  virtual void OnResize(gfx::Size size) = 0;
+  virtual void OnResize(gfx::Size size, float scale_factor) = 0;
   virtual void SetLatencyInfo(
       const cc::LatencyInfo& latency_info) = 0;
 
@@ -158,7 +158,7 @@ class ImageTransportHelper
   void OnResizeViewACK();
 
   // Backbuffer resize callback.
-  void Resize(gfx::Size size);
+  void Resize(gfx::Size size, float scale_factor);
 
   void SetLatencyInfo(const cc::LatencyInfo& latency_info);
 
@@ -196,7 +196,7 @@ class PassThroughImageTransportSurface
   virtual void OnBufferPresented(
       const AcceleratedSurfaceMsg_BufferPresented_Params& params) OVERRIDE;
   virtual void OnResizeViewACK() OVERRIDE;
-  virtual void OnResize(gfx::Size size) OVERRIDE;
+  virtual void OnResize(gfx::Size size, float scale_factor) OVERRIDE;
   virtual gfx::Size GetSize() OVERRIDE;
   virtual void SetLatencyInfo(
       const cc::LatencyInfo& latency_info) OVERRIDE;
diff --git a/content/common/gpu/image_transport_surface_mac.cc b/content/common/gpu/image_transport_surface_mac.cc
index 62c3265..c27e47a 100644
--- a/content/common/gpu/image_transport_surface_mac.cc
+++ b/content/common/gpu/image_transport_surface_mac.cc
@@ -59,7 +59,7 @@ class IOSurfaceImageTransportSurface : public gfx::NoOpGLSurfaceCGL,
   virtual void OnBufferPresented(
       const AcceleratedSurfaceMsg_BufferPresented_Params& params) OVERRIDE;
   virtual void OnResizeViewACK() OVERRIDE;
-  virtual void OnResize(gfx::Size size) OVERRIDE;
+  virtual void OnResize(gfx::Size size, float scale_factor) OVERRIDE;
   virtual void SetLatencyInfo(const cc::LatencyInfo&) OVERRIDE;
 
  private:
@@ -86,6 +86,7 @@ class IOSurfaceImageTransportSurface : public gfx::NoOpGLSurfaceCGL,
 
   gfx::Size size_;
   gfx::Size rounded_size_;
+  float scale_factor_;
 
   // Whether or not we've successfully made the surface current once.
   bool made_current_;
@@ -129,6 +130,7 @@ IOSurfaceImageTransportSurface::IOSurfaceImageTransportSurface(
       texture_id_(0),
       io_surface_handle_(0),
       context_(NULL),
+      scale_factor_(1),
       made_current_(false),
       is_swap_buffers_pending_(false),
       did_unschedule_(false) {
@@ -184,7 +186,7 @@ bool IOSurfaceImageTransportSurface::OnMakeCurrent(gfx::GLContext* context) {
   if (made_current_)
     return true;
 
-  OnResize(gfx::Size(1, 1));
+  OnResize(gfx::Size(1, 1), 1.f);
 
   made_current_ = true;
   return true;
@@ -289,7 +291,8 @@ void IOSurfaceImageTransportSurface::OnResizeViewACK() {
   NOTREACHED();
 }
 
-void IOSurfaceImageTransportSurface::OnResize(gfx::Size size) {
+void IOSurfaceImageTransportSurface::OnResize(gfx::Size size,
+                                              float scale_factor) {
   // This trace event is used in gpu_feature_browsertest.cc - the test will need
   // to be updated if this event is changed or moved.
   TRACE_EVENT2("gpu", "IOSurfaceImageTransportSurface::OnResize",
@@ -298,6 +301,7 @@ void IOSurfaceImageTransportSurface::OnResize(gfx::Size size) {
   DCHECK(context_->IsCurrent(this));
 
   size_ = size;
+  scale_factor_ = scale_factor;
 
   CreateIOSurface();
 }
diff --git a/content/common/gpu/image_transport_surface_win.cc b/content/common/gpu/image_transport_surface_win.cc
index ba2cf42..c37e7d8 100644
--- a/content/common/gpu/image_transport_surface_win.cc
+++ b/content/common/gpu/image_transport_surface_win.cc
@@ -47,7 +47,7 @@ class PbufferImageTransportSurface
   virtual void OnBufferPresented(
       const AcceleratedSurfaceMsg_BufferPresented_Params& params) OVERRIDE;
   virtual void OnResizeViewACK() OVERRIDE;
-  virtual void OnResize(gfx::Size size) OVERRIDE;
+  virtual void OnResize(gfx::Size size, float scale_factor) OVERRIDE;
   virtual void SetLatencyInfo(const cc::LatencyInfo&) OVERRIDE;
   virtual gfx::Size GetSize() OVERRIDE;
 
@@ -219,7 +219,8 @@ void PbufferImageTransportSurface::OnResizeViewACK() {
   NOTREACHED();
 }
 
-void PbufferImageTransportSurface::OnResize(gfx::Size size) {
+void PbufferImageTransportSurface::OnResize(gfx::Size size,
+                                            float scale_factor) {
   DCHECK(backbuffer_suggested_allocation_);
   DCHECK(frontbuffer_suggested_allocation_);
   Resize(size);
diff --git a/content/common/gpu/texture_image_transport_surface.cc b/content/common/gpu/texture_image_transport_surface.cc
index 858c023..eb419bc 100644
--- a/content/common/gpu/texture_image_transport_surface.cc
+++ b/content/common/gpu/texture_image_transport_surface.cc
@@ -31,6 +31,7 @@ TextureImageTransportSurface::TextureImageTransportSurface(
     const gfx::GLSurfaceHandle& handle)
       : fbo_id_(0),
         backbuffer_(CreateTextureDefinition(gfx::Size(), 0)),
+        scale_factor_(1.f),
         stub_destroyed_(false),
         backbuffer_suggested_allocation_(true),
         frontbuffer_suggested_allocation_(true),
@@ -168,8 +169,10 @@ void* TextureImageTransportSurface::GetConfig() {
   return surface_.get() ? surface_->GetConfig() : NULL;
 }
 
-void TextureImageTransportSurface::OnResize(gfx::Size size) {
+void TextureImageTransportSurface::OnResize(gfx::Size size,
+                                            float scale_factor) {
   current_size_ = size;
+  scale_factor_ = scale_factor;
   CreateBackTexture();
 }
 
diff --git a/content/common/gpu/texture_image_transport_surface.h b/content/common/gpu/texture_image_transport_surface.h
index 9ab9abc..9510625 100644
--- a/content/common/gpu/texture_image_transport_surface.h
+++ b/content/common/gpu/texture_image_transport_surface.h
@@ -54,7 +54,7 @@ class TextureImageTransportSurface
   virtual void OnBufferPresented(
       const AcceleratedSurfaceMsg_BufferPresented_Params& params) OVERRIDE;
   virtual void OnResizeViewACK() OVERRIDE;
-  virtual void OnResize(gfx::Size size) OVERRIDE;
+  virtual void OnResize(gfx::Size size, float scale_factor) OVERRIDE;
   virtual void SetLatencyInfo(
       const cc::LatencyInfo& latency_info) OVERRIDE;
 
@@ -93,6 +93,7 @@ class TextureImageTransportSurface
   // The current size of the GLSurface. Used to disambiguate from the current
   // texture size which might be outdated (since we use two buffers).
   gfx::Size current_size_;
+  float scale_factor_;
 
   // Whether or not the command buffer stub has been destroyed.
   bool stub_destroyed_;
diff --git a/gpu/GLES2/gl2extchromium.h b/gpu/GLES2/gl2extchromium.h
index d23191c..2568074 100644
--- a/gpu/GLES2/gl2extchromium.h
+++ b/gpu/GLES2/gl2extchromium.h
@@ -575,7 +575,8 @@ typedef void (GL_APIENTRYP PFNGLDRAWBUFFERSEXTPROC) (
 #ifndef GL_CHROMIUM_resize
 #define GL_CHROMIUM_resize 1
 #ifdef GL_GLEXT_PROTOTYPES
-GL_APICALL void GL_APIENTRY glResizeCHROMIUM(GLuint width, GLuint height);
+GL_APICALL void GL_APIENTRY glResizeCHROMIUM(
+    GLuint width, GLuint height, GLfloat scale_factor);
 #endif
 typedef void (GL_APIENTRYP PFNGLRESIZECHROMIUMPROC) (
     GLuint width, GLuint height);
diff --git a/gpu/command_buffer/client/gles2_c_lib_autogen.h b/gpu/command_buffer/client/gles2_c_lib_autogen.h
index 6df6060..f617163 100644
--- a/gpu/command_buffer/client/gles2_c_lib_autogen.h
+++ b/gpu/command_buffer/client/gles2_c_lib_autogen.h
@@ -618,8 +618,8 @@ void* GLES2MapTexSubImage2DCHROMIUM(
 void GLES2UnmapTexSubImage2DCHROMIUM(const void* mem) {
   gles2::GetGLContext()->UnmapTexSubImage2DCHROMIUM(mem);
 }
-void GLES2ResizeCHROMIUM(GLuint width, GLuint height) {
-  gles2::GetGLContext()->ResizeCHROMIUM(width, height);
+void GLES2ResizeCHROMIUM(GLuint width, GLuint height, GLfloat scale_factor) {
+  gles2::GetGLContext()->ResizeCHROMIUM(width, height, scale_factor);
 }
 const GLchar* GLES2GetRequestableExtensionsCHROMIUM() {
   return gles2::GetGLContext()->GetRequestableExtensionsCHROMIUM();
diff --git a/gpu/command_buffer/client/gles2_cmd_helper_autogen.h b/gpu/command_buffer/client/gles2_cmd_helper_autogen.h
index 1a99879..a290365 100644
--- a/gpu/command_buffer/client/gles2_cmd_helper_autogen.h
+++ b/gpu/command_buffer/client/gles2_cmd_helper_autogen.h
@@ -1777,11 +1777,11 @@
     }
   }
 
-  void ResizeCHROMIUM(GLuint width, GLuint height) {
+  void ResizeCHROMIUM(GLuint width, GLuint height, GLfloat scale_factor) {
     gles2::cmds::ResizeCHROMIUM* c =
         GetCmdSpace<gles2::cmds::ResizeCHROMIUM>();
     if (c) {
-      c->Init(width, height);
+      c->Init(width, height, scale_factor);
     }
   }
 
diff --git a/gpu/command_buffer/client/gles2_implementation.cc b/gpu/command_buffer/client/gles2_implementation.cc
index 3837424..b64c67b 100644
--- a/gpu/command_buffer/client/gles2_implementation.cc
+++ b/gpu/command_buffer/client/gles2_implementation.cc
@@ -2867,11 +2867,12 @@ void GLES2Implementation::UnmapTexSubImage2DCHROMIUM(const void* mem) {
   CheckGLError();
 }
 
-void GLES2Implementation::ResizeCHROMIUM(GLuint width, GLuint height) {
+void GLES2Implementation::ResizeCHROMIUM(GLuint width, GLuint height,
+                                         float scale_factor) {
   GPU_CLIENT_SINGLE_THREAD_CHECK();
   GPU_CLIENT_LOG("[" << GetLogPrefix() << "] glResizeCHROMIUM("
-                 << width << ", " << height << ")");
-  helper_->ResizeCHROMIUM(width, height);
+                 << width << ", " << height << ", " << scale_factor << ")");
+  helper_->ResizeCHROMIUM(width, height, scale_factor);
   CheckGLError();
 }
 
diff --git a/gpu/command_buffer/client/gles2_implementation_autogen.h b/gpu/command_buffer/client/gles2_implementation_autogen.h
index 3123b59..b60730b 100644
--- a/gpu/command_buffer/client/gles2_implementation_autogen.h
+++ b/gpu/command_buffer/client/gles2_implementation_autogen.h
@@ -453,7 +453,8 @@ virtual void* MapTexSubImage2DCHROMIUM(
 
 virtual void UnmapTexSubImage2DCHROMIUM(const void* mem) OVERRIDE;
 
-virtual void ResizeCHROMIUM(GLuint width, GLuint height) OVERRIDE;
+virtual void ResizeCHROMIUM(
+    GLuint width, GLuint height, GLfloat scale_factor) OVERRIDE;
 
 virtual const GLchar* GetRequestableExtensionsCHROMIUM() OVERRIDE;
 
diff --git a/gpu/command_buffer/client/gles2_implementation_unittest_autogen.h b/gpu/command_buffer/client/gles2_implementation_unittest_autogen.h
index d783468..a93f8eb 100644
--- a/gpu/command_buffer/client/gles2_implementation_unittest_autogen.h
+++ b/gpu/command_buffer/client/gles2_implementation_unittest_autogen.h
@@ -1643,9 +1643,9 @@ TEST_F(GLES2ImplementationTest, ResizeCHROMIUM) {
     cmds::ResizeCHROMIUM cmd;
   };
   Cmds expected;
-  expected.cmd.Init(1, 2);
+  expected.cmd.Init(1, 2, 3);
 
-  gl_->ResizeCHROMIUM(1, 2);
+  gl_->ResizeCHROMIUM(1, 2, 3);
   EXPECT_EQ(0, memcmp(&expected, commands_, sizeof(expected)));
 }
 // TODO: Implement unit test for GetRequestableExtensionsCHROMIUM
diff --git a/gpu/command_buffer/client/gles2_interface_autogen.h b/gpu/command_buffer/client/gles2_interface_autogen.h
index 0fca7e8..a933b81 100644
--- a/gpu/command_buffer/client/gles2_interface_autogen.h
+++ b/gpu/command_buffer/client/gles2_interface_autogen.h
@@ -260,7 +260,8 @@ virtual void* MapTexSubImage2DCHROMIUM(
     GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width,
     GLsizei height, GLenum format, GLenum type, GLenum access) = 0;
 virtual void UnmapTexSubImage2DCHROMIUM(const void* mem) = 0;
-virtual void ResizeCHROMIUM(GLuint width, GLuint height) = 0;
+virtual void ResizeCHROMIUM(GLuint width, GLuint height, GLfloat scale_factor) =
+    0;
 virtual const GLchar* GetRequestableExtensionsCHROMIUM() = 0;
 virtual void RequestExtensionCHROMIUM(const char* extension) = 0;
 virtual void RateLimitOffscreenContextCHROMIUM() = 0;
diff --git a/gpu/command_buffer/client/gles2_interface_stub_autogen.h b/gpu/command_buffer/client/gles2_interface_stub_autogen.h
index 00c3a90..a16fe5d 100644
--- a/gpu/command_buffer/client/gles2_interface_stub_autogen.h
+++ b/gpu/command_buffer/client/gles2_interface_stub_autogen.h
@@ -288,7 +288,8 @@ virtual void* MapTexSubImage2DCHROMIUM(
     GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width,
     GLsizei height, GLenum format, GLenum type, GLenum access) OVERRIDE;
 virtual void UnmapTexSubImage2DCHROMIUM(const void* mem) OVERRIDE;
-virtual void ResizeCHROMIUM(GLuint width, GLuint height) OVERRIDE;
+virtual void ResizeCHROMIUM(
+    GLuint width, GLuint height, GLfloat scale_factor) OVERRIDE;
 virtual const GLchar* GetRequestableExtensionsCHROMIUM() OVERRIDE;
 virtual void RequestExtensionCHROMIUM(const char* extension) OVERRIDE;
 virtual void RateLimitOffscreenContextCHROMIUM() OVERRIDE;
diff --git a/gpu/command_buffer/client/gles2_interface_stub_impl_autogen.h b/gpu/command_buffer/client/gles2_interface_stub_impl_autogen.h
index 36ca9b8..ce4b53b 100644
--- a/gpu/command_buffer/client/gles2_interface_stub_impl_autogen.h
+++ b/gpu/command_buffer/client/gles2_interface_stub_impl_autogen.h
@@ -549,7 +549,7 @@ void* GLES2InterfaceStub::MapTexSubImage2DCHROMIUM(
 void GLES2InterfaceStub::UnmapTexSubImage2DCHROMIUM(const void* /* mem */) {
 }
 void GLES2InterfaceStub::ResizeCHROMIUM(
-    GLuint /* width */, GLuint /* height */) {
+    GLuint /* width */, GLuint /* height */, GLfloat /* scale_factor */) {
 }
 const GLchar* GLES2InterfaceStub::GetRequestableExtensionsCHROMIUM() {
   return 0;
diff --git a/gpu/command_buffer/client/gles2_trace_implementation_autogen.h b/gpu/command_buffer/client/gles2_trace_implementation_autogen.h
index 9888a5d..bef6ce8c 100644
--- a/gpu/command_buffer/client/gles2_trace_implementation_autogen.h
+++ b/gpu/command_buffer/client/gles2_trace_implementation_autogen.h
@@ -288,7 +288,8 @@ virtual void* MapTexSubImage2DCHROMIUM(
     GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width,
     GLsizei height, GLenum format, GLenum type, GLenum access) OVERRIDE;
 virtual void UnmapTexSubImage2DCHROMIUM(const void* mem) OVERRIDE;
-virtual void ResizeCHROMIUM(GLuint width, GLuint height) OVERRIDE;
+virtual void ResizeCHROMIUM(
+    GLuint width, GLuint height, GLfloat scale_factor) OVERRIDE;
 virtual const GLchar* GetRequestableExtensionsCHROMIUM() OVERRIDE;
 virtual void RequestExtensionCHROMIUM(const char* extension) OVERRIDE;
 virtual void RateLimitOffscreenContextCHROMIUM() OVERRIDE;
diff --git a/gpu/command_buffer/client/gles2_trace_implementation_impl_autogen.h b/gpu/command_buffer/client/gles2_trace_implementation_impl_autogen.h
index 40be4e9..a99a36a 100644
--- a/gpu/command_buffer/client/gles2_trace_implementation_impl_autogen.h
+++ b/gpu/command_buffer/client/gles2_trace_implementation_impl_autogen.h
@@ -1013,9 +1013,10 @@ void GLES2TraceImplementation::UnmapTexSubImage2DCHROMIUM(const void* mem) {
   gl_->UnmapTexSubImage2DCHROMIUM(mem);
 }
 
-void GLES2TraceImplementation::ResizeCHROMIUM(GLuint width, GLuint height) {
+void GLES2TraceImplementation::ResizeCHROMIUM(
+    GLuint width, GLuint height, GLfloat scale_factor) {
   TRACE_EVENT_BINARY_EFFICIENT0("gpu", "GLES2Trace::ResizeCHROMIUM");
-  gl_->ResizeCHROMIUM(width, height);
+  gl_->ResizeCHROMIUM(width, height, scale_factor);
 }
 
 const GLchar* GLES2TraceImplementation::GetRequestableExtensionsCHROMIUM() {
diff --git a/gpu/command_buffer/cmd_buffer_functions.txt b/gpu/command_buffer/cmd_buffer_functions.txt
index ec68be4..ef56e5a 100644
--- a/gpu/command_buffer/cmd_buffer_functions.txt
+++ b/gpu/command_buffer/cmd_buffer_functions.txt
@@ -182,7 +182,7 @@ GL_APICALL void*        GL_APIENTRY glMapBufferSubDataCHROMIUM (GLuint target, G
 GL_APICALL void         GL_APIENTRY glUnmapBufferSubDataCHROMIUM (const void* mem);
 GL_APICALL void*        GL_APIENTRY glMapTexSubImage2DCHROMIUM (GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, GLenum type, GLenum access);
 GL_APICALL void         GL_APIENTRY glUnmapTexSubImage2DCHROMIUM (const void* mem);
-GL_APICALL void         GL_APIENTRY glResizeCHROMIUM (GLuint width, GLuint height);
+GL_APICALL void         GL_APIENTRY glResizeCHROMIUM (GLuint width, GLuint height, GLfloat scale_factor);
 GL_APICALL const GLchar* GL_APIENTRY glGetRequestableExtensionsCHROMIUM (void);
 GL_APICALL void         GL_APIENTRY glRequestExtensionCHROMIUM (const char* extension);
 GL_APICALL void         GL_APIENTRY glRateLimitOffscreenContextCHROMIUM (void);
diff --git a/gpu/command_buffer/common/gles2_cmd_format_autogen.h b/gpu/command_buffer/common/gles2_cmd_format_autogen.h
index 2e2b736..12fc743 100644
--- a/gpu/command_buffer/common/gles2_cmd_format_autogen.h
+++ b/gpu/command_buffer/common/gles2_cmd_format_autogen.h
@@ -9449,30 +9449,34 @@ struct ResizeCHROMIUM {
     header.SetCmd<ValueType>();
   }
 
-  void Init(GLuint _width, GLuint _height) {
+  void Init(GLuint _width, GLuint _height, GLfloat _scale_factor) {
     SetHeader();
     width = _width;
     height = _height;
+    scale_factor = _scale_factor;
   }
 
-  void* Set(void* cmd, GLuint _width, GLuint _height) {
-    static_cast<ValueType*>(cmd)->Init(_width, _height);
+  void* Set(void* cmd, GLuint _width, GLuint _height, GLfloat _scale_factor) {
+    static_cast<ValueType*>(cmd)->Init(_width, _height, _scale_factor);
     return NextCmdAddress<ValueType>(cmd);
   }
 
   gpu::CommandHeader header;
   uint32 width;
   uint32 height;
+  float scale_factor;
 };
 
-COMPILE_ASSERT(sizeof(ResizeCHROMIUM) == 12,
-               Sizeof_ResizeCHROMIUM_is_not_12);
+COMPILE_ASSERT(sizeof(ResizeCHROMIUM) == 16,
+               Sizeof_ResizeCHROMIUM_is_not_16);
 COMPILE_ASSERT(offsetof(ResizeCHROMIUM, header) == 0,
                OffsetOf_ResizeCHROMIUM_header_not_0);
 COMPILE_ASSERT(offsetof(ResizeCHROMIUM, width) == 4,
                OffsetOf_ResizeCHROMIUM_width_not_4);
 COMPILE_ASSERT(offsetof(ResizeCHROMIUM, height) == 8,
                OffsetOf_ResizeCHROMIUM_height_not_8);
+COMPILE_ASSERT(offsetof(ResizeCHROMIUM, scale_factor) == 12,
+               OffsetOf_ResizeCHROMIUM_scale_factor_not_12);
 
 struct GetRequestableExtensionsCHROMIUM {
   typedef GetRequestableExtensionsCHROMIUM ValueType;
diff --git a/gpu/command_buffer/common/gles2_cmd_format_test_autogen.h b/gpu/command_buffer/common/gles2_cmd_format_test_autogen.h
index e11bc47..b23b569 100644
--- a/gpu/command_buffer/common/gles2_cmd_format_test_autogen.h
+++ b/gpu/command_buffer/common/gles2_cmd_format_test_autogen.h
@@ -3706,12 +3706,14 @@ TEST_F(GLES2FormatTest, ResizeCHROMIUM) {
   void* next_cmd = cmd.Set(
       &cmd,
       static_cast<GLuint>(11),
-      static_cast<GLuint>(12));
+      static_cast<GLuint>(12),
+      static_cast<GLfloat>(13));
   EXPECT_EQ(static_cast<uint32>(cmds::ResizeCHROMIUM::kCmdId),
             cmd.header.command);
   EXPECT_EQ(sizeof(cmd), cmd.header.size * 4u);
   EXPECT_EQ(static_cast<GLuint>(11), cmd.width);
   EXPECT_EQ(static_cast<GLuint>(12), cmd.height);
+  EXPECT_EQ(static_cast<GLfloat>(13), cmd.scale_factor);
   CheckBytesWrittenMatchesExpectedSize(
       next_cmd, sizeof(cmd));
 }
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index cdc83c8..2fad005 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -561,7 +561,7 @@ class GLES2DecoderImpl : public GLES2Decoder {
   virtual void PerformIdleWork() OVERRIDE;
 
   virtual void SetResizeCallback(
-      const base::Callback<void(gfx::Size)>& callback) OVERRIDE;
+      const base::Callback<void(gfx::Size, float)>& callback) OVERRIDE;
 
   virtual Logger* GetLogger() OVERRIDE;
   virtual ErrorState* GetErrorState() OVERRIDE;
@@ -1626,7 +1626,7 @@ class GLES2DecoderImpl : public GLES2Decoder {
 
   scoped_ptr<VertexArrayManager> vertex_array_manager_;
 
-  base::Callback<void(gfx::Size)> resize_callback_;
+  base::Callback<void(gfx::Size, float)> resize_callback_;
 
   WaitSyncPointCallback wait_sync_point_callback_;
 
@@ -3025,7 +3025,7 @@ void GLES2DecoderImpl::UpdateParentTextureInfo() {
 }
 
 void GLES2DecoderImpl::SetResizeCallback(
-    const base::Callback<void(gfx::Size)>& callback) {
+    const base::Callback<void(gfx::Size, float)>& callback) {
   resize_callback_ = callback;
 }
 
@@ -3430,6 +3430,7 @@ error::Error GLES2DecoderImpl::HandleResizeCHROMIUM(
 
   GLuint width = static_cast<GLuint>(c.width);
   GLuint height = static_cast<GLuint>(c.height);
+  GLfloat scale_factor = c.scale_factor;
   TRACE_EVENT2("gpu", "glResizeChromium", "width", width, "height", height);
 
   width = std::max(1U, width);
@@ -3450,7 +3451,7 @@ error::Error GLES2DecoderImpl::HandleResizeCHROMIUM(
   }
 
   if (!resize_callback_.is_null()) {
-    resize_callback_.Run(gfx::Size(width, height));
+    resize_callback_.Run(gfx::Size(width, height), scale_factor);
     DCHECK(context_->IsCurrent(surface_.get()));
     if (!context_->IsCurrent(surface_.get())) {
       LOG(ERROR) << "GLES2DecoderImpl: Context lost because context no longer "
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.h b/gpu/command_buffer/service/gles2_cmd_decoder.h
index 14c82f0..86d4801 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.h
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.h
@@ -173,7 +173,7 @@ class GPU_EXPORT GLES2Decoder : public base::SupportsWeakPtr<GLES2Decoder>,
   // Sets a callback which is called when a glResizeCHROMIUM command
   // is processed.
   virtual void SetResizeCallback(
-      const base::Callback<void(gfx::Size)>& callback) = 0;
+      const base::Callback<void(gfx::Size, float)>& callback) = 0;
 
   virtual void SetStreamTextureManager(StreamTextureManager* manager) = 0;
 
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder_mock.h b/gpu/command_buffer/service/gles2_cmd_decoder_mock.h
index 12d1cbd..3f714bd 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder_mock.h
+++ b/gpu/command_buffer/service/gles2_cmd_decoder_mock.h
@@ -68,7 +68,8 @@ class MockGLES2Decoder : public GLES2Decoder {
   MOCK_CONST_METHOD1(RestoreTextureUnitBindings, void(unsigned unit));
   MOCK_METHOD0(GetQueryManager, gpu::gles2::QueryManager*());
   MOCK_METHOD0(GetVertexArrayManager, gpu::gles2::VertexArrayManager*());
-  MOCK_METHOD1(SetResizeCallback, void(const base::Callback<void(gfx::Size)>&));
+  MOCK_METHOD1(
+      SetResizeCallback, void(const base::Callback<void(gfx::Size, float)>&));
   MOCK_METHOD1(SetStreamTextureManager, void(StreamTextureManager*));
   MOCK_METHOD0(GetAsyncPixelTransferDelegate,
       AsyncPixelTransferDelegate*());
diff --git a/ppapi/lib/gl/include/GLES2/gl2ext.h b/ppapi/lib/gl/include/GLES2/gl2ext.h
index 8effd30..ce2cbf0 100644
--- a/ppapi/lib/gl/include/GLES2/gl2ext.h
+++ b/ppapi/lib/gl/include/GLES2/gl2ext.h
@@ -1748,7 +1748,8 @@ typedef void  (GL_APIENTRYP PFNGLUNMAPTEXSUBIMAGE2DCHROMIUM) (const void* mem);
 #ifdef GL_GLEXT_PROTOTYPES
 #define glResizeCHROMIUM GLES2_GET_FUN(ResizeCHROMIUM)
 #if !defined(GLES2_USE_CPP_BINDINGS)
-GL_APICALL void GL_APIENTRY glResizeCHROMIUM (GLuint width, GLuint height);
+GL_APICALL void GL_APIENTRY glResizeCHROMIUM (
+    GLuint width, GLuint height, GLfloat scale_factor);
 #endif
 #else
 typedef void (GL_APIENTRYP PFNGLRESIZECHROMIUM) (GLuint width, GLuint height);
diff --git a/ppapi/shared_impl/ppb_graphics_3d_shared.cc b/ppapi/shared_impl/ppb_graphics_3d_shared.cc
index fbe7221..4960db5 100644
--- a/ppapi/shared_impl/ppb_graphics_3d_shared.cc
+++ b/ppapi/shared_impl/ppb_graphics_3d_shared.cc
@@ -51,7 +51,7 @@ int32_t PPB_Graphics3D_Shared::ResizeBuffers(int32_t width, int32_t height) {
     return PP_ERROR_BADARGUMENT;
 
   ScopedNoLocking already_locked(this);
-  gles2_impl()->ResizeCHROMIUM(width, height);
+  gles2_impl()->ResizeCHROMIUM(width, height, 1.f);
   // TODO(alokp): Check if resize succeeded and return appropriate error code.
   return PP_OK;
 }
diff --git a/webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.cc b/webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.cc
index 64dd273..5235e22 100644
--- a/webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.cc
+++ b/webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.cc
@@ -158,7 +158,7 @@ class GLInProcessContext {
 
   ::gpu::gles2::GLES2Decoder* GetDecoder();
 
-  void OnResizeView(gfx::Size size);
+  void OnResizeView(gfx::Size size, float scale_factor);
 
  private:
   explicit GLInProcessContext(bool share_resources);
@@ -489,7 +489,7 @@ CommandBufferService* GLInProcessContext::GetCommandBufferService() {
   return decoder_.get();
 }
 
-void GLInProcessContext::OnResizeView(gfx::Size size) {
+void GLInProcessContext::OnResizeView(gfx::Size size, float scale_factor) {
   DCHECK(!surface_->IsOffscreen());
   surface_->Resize(size);
 }
@@ -972,7 +972,7 @@ void WebGraphicsContext3DInProcessCommandBufferImpl::reshapeWithScaleFactor(
   // TODO(gmam): See if we can comment this in.
   // ClearContext();
 
-  gl_->ResizeCHROMIUM(width, height);
+  gl_->ResizeCHROMIUM(width, height, scale_factor);
 }
 
 WebGLId WebGraphicsContext3DInProcessCommandBufferImpl::createCompositorTexture(