Allow using a larger-than-necessary texture as cached render pass backing

cc/direct_renderer.cc

Index: cc/direct_renderer.cc
diff --git a/cc/direct_renderer.cc b/cc/direct_renderer.cc
index 0b2d74b82076e5108b3d1388d18e71a06b43677d..42be62c427ac0d485354a605e3ae89d7b6c30930 100644
--- a/cc/direct_renderer.cc
+++ b/cc/direct_renderer.cc
@@ -134,7 +134,9 @@ void DirectRenderer::decideRenderPassAllocationsForFrame(const RenderPassList& r
         CachedResource* texture = passIterator->second;
         DCHECK(texture);
 
-        if (texture->id() && (texture->size() != requiredSize || texture->format() != requiredFormat))
+        bool sizeAppropriate = texture->size().width() >= requiredSize.width() &&
+                               texture->size().height() >= requiredSize.height();
+        if (texture->id() && (!sizeAppropriate || texture->format() != requiredFormat))
             texture->Free();
     }
 
@@ -267,7 +269,9 @@ bool DirectRenderer::useRenderPass(DrawingFrame& frame, const RenderPass* render
 
     CachedResource* texture = m_renderPassTextures.get(renderPass->id);
     DCHECK(texture);
-    if (!texture->id() && !texture->Allocate(Renderer::ImplPool, renderPassTextureSize(renderPass), renderPassTextureFormat(renderPass), ResourceProvider::TextureUsageFramebuffer))
+
+    gfx::Size size = renderPassTextureSize(renderPass);
+    if (!texture->id() && !texture->Allocate(Renderer::ImplPool, size, renderPassTextureFormat(renderPass), ResourceProvider::TextureUsageFramebuffer))
         return false;
 
     return bindFramebufferToTexture(frame, texture, renderPass->output_rect);