Set memory allocation with visibility, instead of through manager.

This change makes tabs drop their backbuffers and memory usage immediately upon receiving a visibility change notification, instead of going indirectly through the GPU memory manager.

In the future there will be a separate bytes-and-priority limit for both visible and non-visible states (as opposed to the current bytes-only limit for when you're visible and 0 otherwise). The priority limit allow, say, drop everything but visible content.

BUG=134750

Review URL: https://chromiumcodereview.appspot.com/11078017

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@162507 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 3 insertions, 2 deletions

diff --git a/cc/layer_tree_host_impl.h b/cc/layer_tree_host_impl.h
index 1a56c14..b6f57e5 100644
--- a/cc/layer_tree_host_impl.h
+++ b/cc/layer_tree_host_impl.h
@@ -43,7 +43,8 @@ public:
     virtual void setNeedsRedrawOnImplThread() = 0;
     virtual void setNeedsCommitOnImplThread() = 0;
     virtual void postAnimationEventsToMainThreadOnImplThread(scoped_ptr<CCAnimationEventsVector>, double wallClockTime) = 0;
-    virtual void releaseContentsTexturesOnImplThread() = 0;
+    // Returns true if resources were deleted by this call.
+    virtual bool reduceContentsTextureMemoryOnImplThread(size_t limitBytes) = 0;
 };
 
 // CCPinchZoomViewport models the bounds and offset of the viewport that is used during a pinch-zoom operation.
@@ -151,7 +152,6 @@ public:
     virtual void didLoseContext() OVERRIDE;
     virtual void onSwapBuffersComplete() OVERRIDE;
     virtual void setFullRootLayerDamage() OVERRIDE;
-    virtual void releaseContentsTextures() OVERRIDE;
     virtual void setMemoryAllocationLimitBytes(size_t) OVERRIDE;
 
     // WebCompositorOutputSurfaceClient implementation.
@@ -197,6 +197,7 @@ public:
     void setContentsTexturesPurged();
     void resetContentsTexturesPurged();
     size_t memoryAllocationLimitBytes() const { return m_memoryAllocationLimitBytes; }
+    void reduceContentsTextureMemoryOnImplThread(size_t limitBytes);
 
     void setViewportSize(const IntSize& layoutViewportSize, const IntSize& deviceViewportSize);
     const IntSize& layoutViewportSize() const { return m_layoutViewportSize; }